Two capacitors with the same red appearance, CBB21 and CL21, what are the differences?

Difference in volume: 

Due to the use of polyester film material, CL21 is smaller in volume and lighter in weight than CBB21. 

In contrast, CBB21 is slightly larger in volume.

Difference in material: 

CBB21 is a metallized polypropylene film capacitor, which is made by winding polypropylene film.

CL21 is a metallized polyester film capacitor, manufactured by winding polyester film.

Difference in stability: 

CBB21 has better stability, and the range of its capacitance change with temperature is smaller than that of CL21. 

CL21 has slightly poorer stability, especially in high-frequency situations, which is one of the reasons why CL21 cannot generally be used in high-frequency circuits.

Difference in application: 

CBB21 is widely used in high-frequency, DC, AC and pulse circuits, and is suitable for various high-frequency and large-current occasions.

CL21 is suitable for DC blocking, bypassing and coupling of DC and VHF-level signals, and is widely used in filtering and low-pulse circuits.

Find more details: WEET WFA CL21 Dip Coated MKT Metallized Polyester Film Capacitor

                           WEET WFB CBB21 Epoxy PP MKP Metallized Polypropylene Film Capacitor

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WEE Technology Published on Aug 7, 2025